fuse: fix UAF in rcu pathwalks

Browse source

[ Upstream commit 053fc4f755 ]

->permission(), ->get_link() and ->inode_get_acl() might dereference
->s_fs_info (and, in case of ->permission(), ->s_fs_info->fc->user_ns
as well) when called from rcu pathwalk.

Freeing ->s_fs_info->fc is rcu-delayed; we need to make freeing ->s_fs_info
and dropping ->user_ns rcu-delayed too.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Al Viro 2023-09-28 00:19:39 -04:00 • committed by Greg Kroah-Hartman

parent 187d844f2e

commit bfbab62ca6

3 changed files with 13 additions and 6 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

3

fs/fuse/cuse.c

View file

1

fs/fuse/fuse_i.h

View file

15

fs/fuse/inode.c

View file